#include<stdio.h>

#define M 100
#define N 

int main()
{
	printf("hello world!,%d\n",M);
	//printf("hello world\n");
	//printf("hello world\n");
	//printf("hello world\n");
	printf("hello world!\n");
	


#ifdef N
	printf("hello N\n");
#else
	printf("hello no N\n");
#endif
	return 0;
}
